I haven't seen this on this site. I did a search and nothing came up, so if I missed it, I apologize. It has to do with Raine and Genis never questioning why Kratos and Zelos can use magic. I know how they are able to (Aionis Stone), but I don't understand why, at least, Raine, never questioned how a human was able to use magic. Now, I did see a topic about this on another site, but everyone who replied seemed to just explain how they were able to use magic, and not why the Half Elves never inquired about their ability. When Zelos does reveal the reason he is able to use magic, it's in the context of everyone saying that only those with elven blood can wield the Eternal Sword. He then goes on to explain that, because of the stone, he is basically a human with elven blood inside of him, and that's why he can use elven magic. This would seem to imply that the restrictions, in Phantasia, that mean only those with elven blood can use magic is already in place during the time of Symphonia's events. I only say that, because someone, on that site said that "lots of things can change within one thousand years, so that restriction may not have applied in Symphonia". So, why then, didn't Raine, or anyone else ask? With Kratos, it could be that, the humans, at least, thought he may have been a half elf, but that doesn't work for Raine and Genis, because they would be able to sense it. With Zelos, however, this doesn't even work with the human characters, because of the strict caste system in Tethe'alla, and the fact that the Chosen lineage is very carefully selected. A half elf would never be allowed in the Chosen lineage. While it is explained how Zelos can use magic, and Kratos is probably able to use it for the same reason, nobody in-game knows it until close to the end. Now, I think Sheena does say that she wondered how he was able to use magic, she never asked, and neither did Raine or Genis. With Raine, it is particularly out of character, because she is naturally curious of everything.
Now, I only ask because I think there may be something I missed that someone else caught. I'm not trying to point out inconsistencies or plot holes. I'm simply asking for clarification from someone who may have paid more attention than myself.